A robust synchronization method for grid sequence extraction

A robust synchronization method based on least mean square is proposed for the real time detection of fundamental and harmonic symmetrical components, including positive, negative and zero sequence. The new architecture is composed of three parallel structures providing estimation of each phase fundamental and harmonic components delivered into a linear matrix transformation for grid sequence extraction. To achieve frequency adaptation, a combination of least mean square and phase locked loop is used. The paper presents excellent simulation and experimental results in order to verify correctness and validity of the algorithm. Streszczenie. W artykule opisano opracowaną metode synchronizacji z siecią, wykrywającą w czasie rzeczywistym czestotliwośc podstawową oraz wyzsze harmoniczne, w tym skladową zgodną, przeciwną i zerową. Architektura sklada sie z trzech rownoleglych estymatorow harmonicznych dla kazdej fazy. Po przetworzeniu danych i wyznaczeniu skladowych, dokonywana jest synchronizacja, z wykorzystaniem metody najmniejszych kwadratow oraz PLL. Przedstawione zostaly wyniki symulacyjne i eksperymentalne. (Algorytm synchronizacji czestotliwościowej w ekstrakcji skladowych symetrycznych w sieci).

[1]  Li Ran,et al.  Unbalanced Grid Fault Ride-Through Control for a Wind Turbine Inverter , 2007, 2007 IEEE Industry Applications Annual Meeting.

[2]  Waldo Vinton Lyon,et al.  Applications of the method of symmetrical components , 1937 .

[3]  Bimal K. Bose,et al.  A Digital PLL Scheme for Three-Phase System Using Modified Synchronous Reference Frame , 2010, IEEE Transactions on Industrial Electronics.

[4]  Stephen J. Finney,et al.  Three-phase phase-lock loop for distorted utilities , 2007 .

[5]  Jin-Woo Jung,et al.  Power Flow Control of a Single Distributed Generation Unit , 2008, IEEE Transactions on Power Electronics.

[6]  F. Blaabjerg,et al.  Advanced Grid Synchronization System for Power Converters under Unbalanced and Distorted Operating Conditions , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[7]  Seddik Bacha,et al.  New Optimized PWM VSC Control Structures and Strategies Under Unbalanced Voltage Transients , 2007, IEEE Transactions on Industrial Electronics.

[8]  Wenhua Liu,et al.  Control of a Cascade STATCOM With Star Configuration Under Unbalanced Conditions , 2009 .

[9]  Michael T. Manry,et al.  LMS learning algorithms: misconceptions and new results on converence , 2000, IEEE Trans. Neural Networks Learn. Syst..

[10]  C. L. Fortescue,et al.  Method of symmetrical co-ordinates applied to the solution of polyphase networks , 1918, Proceedings of the American Institute of Electrical Engineers.

[11]  Remus Teodorescu,et al.  A New Single-Phase PLL Structure Based on Second Order Generalized Integrator , 2006 .

[12]  Se-Kyo Chung,et al.  A phase tracking system for three phase utility interface inverters , 2000 .

[13]  M. R. Iravani,et al.  A Nonlinear Adaptive Filter for Online Signal Analysis in Power Systems: Applications , 2002, IEEE Power Engineering Review.

[14]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.

[15]  S. Ovaska,et al.  Digital filtering for robust 50/60 Hz zero crossing detectors , 1995, Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC '95.

[16]  F. Blaabjerg,et al.  Detection is key - Harmonic detection methods for active power filter applications , 2007, IEEE Industry Applications Magazine.

[17]  M.B. Duric,et al.  Frequency measurement in power networks in the presence of harmonics using fourier and zero crossing technique , 2005, 2005 IEEE Russia Power Tech.

[18]  Leonardo A. B. Tôrres,et al.  Comparison of Three Single-Phase PLL Algorithms for UPS Applications , 2008, IEEE Transactions on Industrial Electronics.

[19]  Xu Wei-hua.  ADALINE and Its Application in Power Quality Disturbances Detection and Frequency Tracking , 2005 .

[20]  Marco Liserre,et al.  PLL Algorithm for Power Generation Systems Robust to Grid Voltage Faults , 2006 .

[21]  Sergio Busquets-Monge,et al.  Control Strategies Based on Symmetrical Components for Grid-Connected Converters Under Voltage Dips , 2009, IEEE Transactions on Industrial Electronics.

[22]  M.R. Iravani,et al.  A method for synchronization of power electronic converters in polluted and variable-frequency environments , 2004, IEEE Transactions on Power Systems.

[23]  Pablo Fernandez-Comesana,et al.  A Signal-Processing Adaptive Algorithm for Selective Current Harmonic Cancellation in Active Power Filters , 2009, IEEE Transactions on Industrial Electronics.

[24]  Mauricio Aredes,et al.  Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory , 2006, IEEE Transactions on Industrial Electronics.

[25]  D. Boroyevich,et al.  Decoupled Double Synchronous Reference Frame PLL for Power Converters Control , 2007, IEEE Transactions on Power Electronics.

[26]  A.K. Pradhan,et al.  Power system frequency estimation using least mean square technique , 2005, IEEE Transactions on Power Delivery.

[27]  G. C. Paap,et al.  Symmetrical components in the time domain and their application to power network calculations , 2000 .

[28]  V. Blasko,et al.  Operation of a phase locked loop system under distorted utility conditions , 1997 .

[29]  Marco Liserre,et al.  New Positive-sequence Voltage Detector for Grid Synchronization of Power Converters under Faulty Grid Conditions , 2006 .

[30]  Dragan Jovcic,et al.  Phase locked loop system for FACTS , 2003 .

[31]  Seppo J. Ovaska,et al.  Noise reduction in zero crossing detection by predictive digital filtering , 1995, IEEE Trans. Ind. Electron..

[32]  Frede Blaabjerg,et al.  Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults , 2007, IEEE Transactions on Industrial Electronics.